You need to add repository to be able to get the dependencies.
As long as the RPM packages are being built for specific OS configurations (something like different glibc versions and ...) you need to add a compatible repository to your YUM repositories to let it be able to download from them.

Please visit the link below and add the CentOS 6 repository to /etc/yum.repos.d/ folder and change the enabled=0 to enabled=1 to make it available